Isolated from Plakortis species

Fig. 2 Naturally occurring cyclic peroxides of manganese(III) acetate might not be convenient from the viewpoint of organic synthesis, except for the 4-butanolide synthesis.

On the other hand, tris(2,4-pentandionato)manganese(III) (manganese(III) acetylacetonate), Mn(acac)3, is soluble in both polar and nonpolar solvents, although its oxidation ability is weaker than that of manganese(III) acetate [73]. Tris(2,4-pentandionato)manganese(III) is slightly soluble even in water, but disproportionates into manganese(II) and (IV), similarly to man-ganese(III) acetate. The complex is stable in organic solvents, however, the ligand-exchange reaction takes place since the complex is labile in a protic solvent such as acetic acid. It is expected that the corresponding ligand radicals may be formed when the reaction accompanies a one electron-transfer